netdev - Re: 5.4 Regression in r8169 with jumbo frames

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Date:   Sun, 1 Dec 2019 10:26:58 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     "Alan J. Wylie" <alan@...ie.me.uk>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: 5.4 Regression in r8169 with jumbo frames - packet loss/delays

On 01.12.2019 09:57, Alan J. Wylie wrote:
> at 22:37 on Sat 30-Nov-2019 Heiner Kallweit (hkallweit1@...il.com) wrote:
> 
>> Thanks for the report. A jumbo fix for one chip version may have
>> revealed an issue with another chip version. Could you please try
>> the following?
>> I checked the vendor driver r8168 and there's no special sequence
>> to configure jumbo mode.
>>
>> What would be interesting:
>> Do you set the (jumbo) MTU before bringing the device up?
>>
>> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
>> index 0b47db2ff..38d212686 100644
>> --- a/drivers/net/ethernet/realtek/r8169_main.c
>> +++ b/drivers/net/ethernet/realtek/r8169_main.c
>> @@ -3873,7 +3873,7 @@ static void rtl_hw_jumbo_enable(struct rtl8169_private *tp)
>>  	case RTL_GIGA_MAC_VER_27 ... RTL_GIGA_MAC_VER_28:
>>  		r8168dp_hw_jumbo_enable(tp);
>>  		break;
>> -	case RTL_GIGA_MAC_VER_31 ... RTL_GIGA_MAC_VER_34:
>> +	case RTL_GIGA_MAC_VER_31 ... RTL_GIGA_MAC_VER_33:
>>  		r8168e_hw_jumbo_enable(tp);
>>  		break;
>>  	default:
>> -- 
>> 2.24.0
> 
> That patch fixes the issue for me.
> 
Great, thanks for the feedback!

> Thanks
> 
> Alan
> 
Heineer